Guardian of your heart -- SnapECG Hand held EKG monitor SnapECG is committed to provide the most accurate assessment for cardiopaths and giving them more peace of mind. We use a worldwide leading intelligent algorithm and hand touching technology which evaluates the properties of the EKG waveform, to minimise misdiagnosis and mistreatment and over-medical treatment by the Afib cardiac monitor. It records a single-lead heart rhythm which allows you to share EKG recordings with your doctors. SnapECG Heart monitor cooperate with many well-known medical institutions, and recommended by medical consultans as IR allows users to detect the cardiac disease earlier for timely treatment. Medical precision - lead: single-lead - measurement time: 30s/1min/ 3mins/5mins/continuous - sensitivity(gain): 5mm/mv (x0.5); 10mm/mv (x1); 20mm/mv (x2); error range+-10% - scanning speed: 12.5/25/50mm/S (error range+-10%) product dimension: 83mmx35mm x3.5mm product weight: 14g packing contents: electrocardiogram recorder x1 button battery (CR1620) x2 welcome guide x1 tips-during measurement 1. Take a measurement in a quiet environment 2. Maintain a stable emotion and keep breathing smoothly 3. It is recommended to capturing your ECG in a sit-down state 4. Do not move the device or shake the body 5. Keep your fingers properly pressed tips-store EKG history on the Cloud by registration after you register and Log in to your SnapECG account, all EKG measurement history will be stored in cloud drive under your account (no additional fee will be charged). you dont have to worry about data loss when updating the app or replacing new devices. You can still check the EKG monitoring history when you Log in again with a new phone.